Plow-point.



No. 703,807. Patented July I, I902.

' s. c.mvsns.

PLOW POINT.

(Application filed Apr. 24, 1902.)

(No Model.)

UNrrn rates Prion.

" ren't PLOW-POINT.

\ SPECIFICATION forming part of Letters Patent N 0. 703,807, dated July1, 1902.

Application filed April 24, 1902.

To all whom, it may concern:

Beit known that-I, SAMUEL O. lVIYERS, a citizen of the United States,residing at Mifflintown, in the county of Juniata and State of 5Pennsylvania, have invented certain new and useful Improvements inPlow-Points; and I do declare the following to be a full, clear, andexact description of the invention, such as will enable others skilledin the art to whichit appertains to make and use the same.

My invention consists of a plow-point of novel construction, ashereinafter fully set forth.

The purpose of myinvention is to increase the life of plowshares byproviding them with points that may be easily and. quickly renewed ormade sharp again after having been worn down to a blunt point byconstant use.

In the accompanying drawings, Figurel is a perspective view of aplowshare constructed in accordance with my invention. Fig. 2 is asimilar view of the same share after the original point (shown in dottedlines) has been worn dull and been repointed. Fig. 3 is an elevation ofthe point of the share as seen from the land side of a plow. The heavydotted line represents the outline of the point after having beensubject to considerable wear. The light dotted line represents theoutline of the uppersurface of the point after the plate has beenremoved. Fig. 4: is a vertical sectional view through the point of theshare on the line 4 4: of Fig. 6. Fig. 5 is a similar view after theoriginal point, which is outlined in dotted lines, has been worn down toa dull bluntpoiut. Fig. 6 is a horizontal sectional view through thepoint on the line 6 6 of Fig. 4. Fig. 7 is a transverse section on theline 7 7 of Fig. 6, and Fig. 8 is a detail perspective View of the coreand support for the same.

The nose or point of a plowshare Wears away much more rapidly than thebalance of the share, and as a consequence the entire share must bethrown away after the point. becomes dull. To overcome this expensivepractice, various means have been tried, the most satisfactory prior tomy invention being to provide the share with a detachable point whichmay be removed and replaced when dull. This method is not entirelysatisfactory, as it is not always possible to attach the points securelyenough to prevent them from becoming loose, and then the share with aseparate point has not the strength of one with the point castintegrally.

My invention aims to cure the above-indicated objections; and to thisend it consists in casting integrally with the point of the share aplate which forms the upper surface of the point and which may be brokenoff when the extreme point has become blunt to leave a point on theshare that is much sharper than the worn -down point was. This plate isreally nothing more than a portion of the upper part of the pointseparated from the lower or main portion of the share-point. Thethickness of the plate will be much greater at the end adjacent to thepoint'of the nose than at the opposite end in order that the newshare-point formed by the removal of this plate will be sharp. This willbe better understood upon referring to the drawings, in which Aindicates a 'plowshare, B its original point, and O therenewed point. Toall appearances my improved share looks like an ordinary share with thenose or point cast integrally, and it is made or cast in theusualmanner. In order to form the plateor portion that is to be broken away,I support in the matrix or east-space of the mold in which the share isto be cast a core or separator D,

preferably of asbestos or some infusible material. This core D almostentirely separates the upper portion of the point or that part which Iterm the removable plate from the lower portion of the'point of theshare.

On reference to Fig. 6 it will be noted that as shown'at a; but inorderto give additional strength to the point I may provide the core Dwith slots or apertures d, through which the molten metal flows andforms supports or braces b for the plate.

The core may be supported and heldin the proper position during thecasting in any desired manner. I have shown in the drawings a wiresupport E. This support, as clearly seen in Fig. 8, is made of one pieceof'wire bent, as shown, so that the ends 6 rest on the bottom of thecast-space of the mold, and the bent portions 6 bear against the top ofthe away to leave the new point.

cast-space of the mold. It will be seen that bythis arrangement the coremay be readily adjusted to the proper angle.

Of course I do not limit myself to the exact location of the core in thepoint or to the angle which it bears with respect to the bottom of theshare-point. The location of the core in the point will depend partlyupon the nature of the iron used and also upon the taper which it isdesired that the renewed point should have. 1

I preferably locate the core, as shown in Fig. 4 of the drawings, sothat when the point has worn down by use, as shown in Fig. 5, acold-chisel may be readily inserted in the space formed by the core andthe plate or upper surface of the point chipped or broken I wouldfurther have it understood that I do not limit myself to the number ofcores inserted in the point. If desired, I may insert two or more, andthus be able to renew or repoint the share two or more times.

As explained before, the operation of casting my improved share is thesame as formerly, the only difference being the insertion of the core inthe cast-space of the mold before the molten metal is poured in. Thefact that the core is exceedingly thin, of less width than the point,and perforated to allow the metal to run through and unite to formsupports for the plate makes the liability of weakening the point veryslight.

After the point has been worn down until it appears as in Fig. 5 allthat is necessary to obtain a new sharp point is to take a coldchiseland chip ofi the plate, the supports a and Z), and make the top surfaceof the point smooth. It has been found that the upper surface of the newpoint will be slightly chilled during the casting of the share, owing tothe fact that the core is cold and does not become heated readily.

Thus it will be seen that a plowshare constructed in accordance with myinvention costs but slightly more than the old share and is practicallyequivalent to two of the old ones.

It is obvious that various changes may be made in the form, proportion,and manner of separating the removableplate from the lower part of thepoint, and so I do not limit myself to the manner and construction shownin the drawings.

Having thus described my invention, what I claim, and desire to secureby Letters Patcut, is

1. A plowshare having cast integral therewith a plate which throughout aportion of its surface is separated from the body of the plowshare andwhich may be removed when the nose or point has become dull, in order toleave a new sharp nose or point, substantially as set forth.

2. A cast-metal plow-point having an integral plate cast lengthwise ofthe point, forming one surface of the same and capable of being removedto leave a new sharp point, substantially as set forth.

3. As a new article of manufacture, a plowshare having a cast-metalpoint integral therewith, and a plate cast integral with the point andcapable of being removed, substantially as set forth.

4. A plowshare cast hollow at a point in the rear of its original pointor nose whereby when the said original point or nose wears back to thehollow portion, the upper wall thereof may be removed to present a newpoint or nose, substantially as set forth.

Intestimony whereof I have hereunto set my hand in presence of twosubscribing witnesses.

SAMUEL C. MYERS.

WVit'nesses:

J. W. KIRK, BOYD S. BERGEY.

